En route to answer the Brigadier’s summons, the TARDIS is dragged off course. The Doctor, Sarah Jane and Harry find themselves trapped on The Zephyr, a spaceship that is going at full speed and yet is unable to move. With fuel running dangerously low, their only hope lies on Alderasea, a nearby world exclusively for the famous and celebrated.

However, Alderasea has never heard of them and has no intention of letting them land…